BMW 745i 2002-2009

BMW 745i 2002-2009 ZF 6HP Transmission Specifications

Comprehensive technical specifications for the ZF-6HP automatic transmission used in the 2002-2009 BMW 745i. This document covers gear ratios, torque converter details, fluid capacity, shift patterns, and diagnostic codes specific to the ZF-6HP transmission system.

Updated Oct 24, 2023

Overview Specifications

Comprehensive description of the ZF-6HP transmission specifications for the 2002-2009 BMW 745i, including key features, measurements, and technical details.

How to Use

Use the search function to locate specific ZF-6HP transmission specifications by entering keywords such as 'torque converter', 'gear ratios', or 'fluid capacity'.

Navigate through the documentation sections using the table of contents or by scrolling through the major sections: General Specifications, Mechanical Components, Fluid Requirements, and Maintenance Procedures.

Key Specifications

Transmission Type

6-speed automatic

Maximum Torque

600 Nm

Fluid Capacity

9.5 liters

Weight

98 kg (dry)

Fluid Change Interval

60,000 miles or 100,000 km

Available Specifications

General Specifications

This section provides an overview of the ZF-6HP transmission's general technical specifications and design features.

Transmission Type and Design

6-speed automatic transmission with adaptive shift control
Longitudinal mounting configuration for rear-wheel drive
Integrated torque converter with lock-up clutch
Electronically controlled hydraulic system

Dimensions and Weight

Overall length: 720 mm
Width: 450 mm
Height: 350 mm
Weight: 98 kg (dry)

Note: Dimensions and weight may vary slightly depending on the specific model year.

Mechanical Components

Detailed information about the mechanical components of the ZF-6HP transmission, including gear ratios and torque capacity.

Gear Ratios

1st gear: 4.171:1
2nd gear: 2.340:1
3rd gear: 1.521:1
4th gear: 1.143:1
5th gear: 0.867:1
6th gear: 0.691:1
Reverse gear: 3.403:1

Torque Capacity

Maximum input torque: 600 Nm
Torque converter lock-up clutch engagement range: 1500-4500 rpm
Clutch pack design optimized for high torque handling

Note: Torque capacity is dependent on proper fluid levels and maintenance.

Fluid Requirements

Information about the transmission fluid specifications, capacity, and maintenance intervals.

Fluid Type and Capacity

Recommended fluid: ZF Lifeguard 6
Total fluid capacity: 9.5 liters
Fluid change interval: 60,000 miles or 100,000 km
Fluid operating temperature range: -40°C to 150°C

Fluid Maintenance

Use only approved transmission fluid to avoid damage
Check fluid level using the transmission dipstick or electronic level sensor
Fluid should be replaced if discolored or contaminated

Note: Improper fluid levels can lead to transmission slippage or failure.

Maintenance Procedures

Guidelines for maintaining the ZF-6HP transmission, including inspection and service intervals.

Inspection Intervals

Inspect transmission fluid level every 15,000 miles or 24,000 km
Check for leaks and damage to seals and gaskets
Monitor transmission performance for unusual noises or shifting issues

Service Procedures

Replace transmission fluid and filter every 60,000 miles or 100,000 km
Reset transmission adaptation values after fluid change
Perform diagnostic scans to identify fault codes

Note: Regular maintenance is critical to ensure optimal transmission performance and longevity.

Search Specifications

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Transmission Specifications

General information

Transmission Type: 6-speed automatic

Manufacturer: ZF Friedrichshafen AG

Model: 6HP26

Application: 2002-2009 BMW 745i

Part Number: 24 11 7 546 123

Weight: 92 kg (202.8 lbs)

Fluid Specifications

Fluid Type: ZF Lifeguardfluid 6

Capacity: 9.5 liters (10.0 quarts)

Fluid Change interval: 60,000 miles or 60 months

Fluid Temperature Range: -40°C to 150°C (-40°F to 302°F)

Fluid Pressure Range: 2.5 to 4.5 bar (36.3 to 65.3 psi)

Torque Specifications

Torque Converter Bolts: 70 Nm (52 lb-ft)

Transmission Pan Bolts: 10 Nm (7.4 lb-ft)

Transmission Mount Bolts: 40 Nm (29.5 lb-ft)

Output Flange Bolts: 100 Nm (73.8 lb-ft)

Gear Ratios

1st Gear: 4.171:1

2nd Gear: 2.340:1

3rd Gear: 1.521:1

4th Gear: 1.143:1

5th Gear: 0.867:1

6th Gear: 0.691:1

Reverse Gear: 3.403:1

Operational Parameters

Maximum input Torque: 600 Nm (442.5 lb-ft)

Maximum Output Speed: 7000 rpm

Shift Response Time: 150 ms

Operating Temperature Range: -30°C to 120°C (-22°F to 248°F)

Diagnostic Specifications

Diagnostic Tool: BMW ISTA/D or compatible

Fault Codes

P0700
P0715
P0720
P0730

Diagnostic interface: OBD-II

Self Diagnostic Capability: Yes

Maintenance Specifications

Filter Change interval: 60,000 miles or 60 months

Seal inspection Interval: Every 30,000 miles or 30 months

Fluid Level Check interval: Every 15,000 miles or 12 months

Pan Gasket Part Number: 24 11 7 546 124

Safety information

Fluid Handling: Use gloves and safety glasses when handling transmission fluid

Lifting Procedure: Use a transmission jack rated for at least 150 kg (330 lbs)

Disposal instructions: Dispose of used fluid and filters according to local regulations

Related Components

Torque Converter: Part Number: 24 11 7 546 125
Stall Speed: 2200 rpm
Lockup Clutch Engagement Speed: 1800 rpm

Mechatronic Unit: Part Number: 24 11 7 546 126
Solenoid Valves: Shift Solenoid A, Shift Solenoid B, Pressure Control Solenoid
Sensor Types: Speed Sensor, Temperature Sensor, Pressure Sensor

Tolerances

Gear Mesh Tolerance: 0.05 mm (0.002 in)

Shaft End Play: 0.10 mm (0.004 in)

Bearing Clearance: 0.02 mm (0.0008 in)

Service Information Service

Detailed service requirements and schedules for the ZF-6HP transmission in the 2002-2009 BMW 745i

15,000 miles

12 months

Check transmission fluid level
Inspect for leaks
Check transmission mounts

Perform visual inspection and top off fluid if necessary

30,000 miles

30 months

Inspect transmission seals
Check mechatronic unit connections
Perform diagnostic scan

Replace seals if any signs of leakage are found

60,000 miles

60 months

Replace transmission fluid
Replace transmission filter
Inspect torque converter

Use only ZF Lifeguardfluid 6 for refill

Common Questions

Find answers to common questions about torque specifications

What is the fluid capacity of the ZF-6HP transmission in a 2002-2009 BMW 745i?

The ZF-6HP transmission in the 2002-2009 BMW 745i has a fluid capacity of approximately 9.5 liters (10 quarts) when performing a complete fluid change, including the torque converter. Always refer to the manufacturer's specifications for exact measurements.

What type of transmission fluid is recommended for the ZF-6HP transmission?

The ZF-6HP transmission requires ZF Lifeguard 6 or an equivalent synthetic ATF meeting BMW specification LT 71141. Using incorrect fluid can lead to transmission damage and void warranties.

How often should the transmission fluid be changed in the ZF-6HP transmission?

BMW recommends a transmission fluid and filter change every 60,000 to 100,000 miles under normal driving conditions. Severe driving conditions, such as frequent towing or stop-and-go traffic, may require more frequent service intervals.

What are the common symptoms of a failing ZF-6HP transmission?

Common symptoms include harsh shifting, delayed engagement, slipping gears, transmission fluid leaks, and warning lights such as the 'Transmission Fault' or 'Check Engine' light. Immediate professional diagnosis is recommended to prevent further damage.

Can the ZF-6HP transmission be repaired, or does it require replacement?

The ZF-6HP transmission can often be repaired by replacing faulty components such as solenoids, valve bodies, or seals. However, severe internal damage may necessitate a complete transmission replacement. Always consult a certified technician for an accurate diagnosis.

Factory Service Resources

Access official service manuals, technical documents, and repair guides. These resources provide detailed procedures, specifications, and diagrams directly from the manufacturer.

ZF-6HP Transmission Service Manual

Coming Soon

Official ZF service manual for the 6HP transmission, including detailed repair procedures, torque specifications, and diagnostic codes.

BMW 745i Transmission Fluid Change Guide

Coming Soon

Step-by-step guide for performing a transmission fluid and filter change on the 2002-2009 BMW 745i with the ZF-6HP transmission.

ZF Lifeguard 6 Fluid Specifications

Coming Soon

Detailed specifications and compatibility information for ZF Lifeguard 6 transmission fluid, including BMW-approved alternatives.

Common ZF-6HP Transmission Fault Codes

Coming Soon

A comprehensive list of fault codes specific to the ZF-6HP transmission, including causes and recommended repairs.

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Technical Information

All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
Vehicle specifications and procedures may vary by model year, trim level, and region.
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Working on vehicles can be dangerous. Always take proper safety precautions and use appropriate safety equipment.
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